Methods 1 and 2 are best used with new profiles or existing profiles if they were created in Outlook 2003 or 2007. In all cases, it's not a true conversion - a new PST is created and your items are moved or copied to the new PST. There are three methods to do it yourself and one third party tool available to make the conversion.
Converting your PST to a Unicode PST is one of those times when using Import may be the best way.
Normally we feel Import/Export is a poor choice when moving PSTs, except under specific and limited situations. How to Determine if a PST is using ANSI or Unicode Formatīecause of the large file size support, it's highly recommended that you upgrade to the Unicode PST format, however, Microsoft does not offer a tool that upgrades the PST, other than what is built into Outlook: Import/Export.
